CN116219091A - Metallurgical slag waste heat recovery method and system - Google Patents
Metallurgical slag waste heat recovery method and system Download PDFInfo
- Publication number
- CN116219091A CN116219091A CN202211504437.XA CN202211504437A CN116219091A CN 116219091 A CN116219091 A CN 116219091A CN 202211504437 A CN202211504437 A CN 202211504437A CN 116219091 A CN116219091 A CN 116219091A
- Authority
- CN
- China
- Prior art keywords
- slag
- cooling
- waste heat
- recycling
- metallurgical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 295
- 239000002918 waste heat Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000011084 recovery Methods 0.000 title claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 145
- 239000000428 dust Substances 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 238000004064 recycling Methods 0.000 claims abstract description 41
- 239000000779 smoke Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000008030 elimination Effects 0.000 claims description 8
- 238000003379 elimination reaction Methods 0.000 claims description 8
- 238000004513 sizing Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 239000008187 granular material Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 10
- 235000019738 Limestone Nutrition 0.000 description 7
- 239000006028 limestone Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/028—Methods of cooling or quenching molten slag with the permanent addition of cooled slag or other solids
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Abstract
The invention belongs to the technical field of metallurgical slag waste heat recovery energy utilization, and particularly relates to a metallurgical slag waste heat recovery method and a metallurgical slag waste heat recovery system, wherein the recovery method comprises the following steps: adding the cooled slag after finishing the grains into the liquid slag, and stirring to obtain solidified mixed slag; coarse crushing the mixed slag to obtain granulated slag and smoke dust; cooling the granulated slag to obtain hot air and cooling slag; finishing the cooling slag; and recycling the smoke dust, the hot air and the cooling slag after finishing. The recovery method and the recovery system provided by the invention can be used for thoroughly recovering and reutilizing the waste heat in the metallurgical slag, and the whole recovery method is low in cost, pollution-free, simple in process, high in efficiency, practical and suitable for recovering and reutilizing the waste heat of various metallurgical slag.
Description
Technical Field
The invention belongs to the technical field of metallurgical slag waste heat recovery energy utilization, and particularly relates to a metallurgical slag waste heat recovery method and a metallurgical slag waste heat recovery system.
Background
Steel is the structural material with the greatest human consumption and the functional material with the highest yield. With the high-speed increase of steel output, resource, energy and environmental pollution have become limiting factors for restricting the sustainable development of the steel industry in China. Wherein, a great amount of high-temperature metallurgical slag is generated in blast furnace, converter and electric furnace smelting engineering, and the effective treatment of the high-temperature slag and the recovery of heat contained in the high-temperature metallurgical slag are significant for saving energy consumption, water consumption and pollutant emission of iron and steel enterprises.
Most of liquid slag treatment systems of metallurgical enterprises at home and abroad adopt traditional processes such as a dry slag method, a hot-closed method, a high-pressure water quenching method and the like, so that most of heat energy of liquid slag is not recovered, and some of the liquid slag needs to be cooled by a large amount of water, so that a large amount of energy and water resources are wasted, and meanwhile, pollution is brought to the environment, and huge environmental protection cost is needed to be borne. The problem of liquid slag treatment has been a major concern for a long time. The temperature of the liquid slag generated in the general smelting process is 1450-1650 ℃, the enthalpy of the liquid slag is about 1670MJ/t, the calorific value is about equivalent to 65kg of standard coal, and the liquid slag belongs to high-quality waste heat resources. The production enterprises with the slag quantity of 50 ten thousand tons in one year are used as the enterprises, for example, 50 percent of waste heat in the enterprises can be recovered, which is equivalent to saving 3.25 ten thousand tons of standard coal each year. Therefore, the liquid slag waste heat recovery benefit is quite considerable.
In the prior art, recovery of waste heat of liquid slag is also proposed, for example, a system and a method for comprehensive treatment and sensible heat recovery of blast furnace slag are proposed in a patent with publication number of CN104975117A, in the process of blast furnace ironmaking, molten blast furnace slag at 1400-1600 ℃ is discharged, the blast furnace slag is received by a slag receiving tank and transported to a slag storage tank, and then the slag is led into a buffer tank through a slag chute at the bottom of the slag storage tank; weighing a certain weight of limestone from a limestone storage bin through a feeding weighing machine, feeding the limestone into a ball mill to grind the limestone with a certain fineness, and then feeding the limestone into a buffer tank through a conveying pipeline; part of cold slag sent by the bucket elevator is also sent into the buffer tank, and is primarily mixed with blast furnace slag and limestone in the buffer tank; the slag after preliminary mixing enters a rotary kiln to be fully and uniformly mixed, the alkalinity R of the slag after uniform mixing is 2.0-2.1 by controlling the amount of limestone entering, the weight percentage of magnesium oxide is less than or equal to 10%, the slag after modification does not need to be rapidly cooled in the cooling process, and the equivalent activity can be maintained, so that the use value of the slag as a cement raw material is not influenced; meanwhile, the high-temperature blast furnace slag is cooled by controlling the amount of the cold slag, so that the high-temperature blast furnace slag is crushed into block slag; and the block slag after fully and uniformly mixing and tempering by the rotary kiln falls on the grate cooler, exchanges heat with cooling air blown in from the lower part, and is discharged out of the grate cooler after being fully cooled, and the temperature is reduced to below 150 ℃. Slag discharged from the grate cooler is divided into two parts: a part of the materials are conveyed to a finished product warehouse through a chain conveyor; the other part of slag with proper granularity is sent into a buffer tank through a cold slag circulating unit, and is contacted with the high-temperature slag for heat exchange, so that the effects of cooling and crushing the high-temperature slag are achieved; the cooling air exchanges heat with the high-temperature slag in the grate cooler and becomes hot waste gas; the medium-temperature waste gas is sent into a waste heat boiler from a grate cooler air outlet through an air pipe to exchange heat and then generate superheated steam, so that a steam turbine and a generator are pushed to realize heat energy conversion into electric energy; and the residual air of the grate cooler is discharged from a residual air port and is converged with the tail exhaust of the waste heat boiler, and then is discharged into the atmosphere through a dust remover, an induced draft fan and a chimney in sequence. In the patent, although the slag and hot air discharged from the grate cooler are utilized, the slag and hot air are required to pass through a slag receiving tank, a slag storage tank, a buffer tank, a rotary kiln, the grate cooler and other processes, the process flow is complex, the process investment cost is high, the heat loss is large, and the heat recovery efficiency is low; and the patent is not provided with a crushing device and a dust removing device, the equipment failure rate of the massive metallurgical slag can be increased, and the equipment loss of the waste heat boiler system can be increased by hot air without dust removal.
Therefore, the method which is simpler in process, more complete in equipment, lower in cost and higher in efficiency and can fully recycle the waste heat of the liquid slag is particularly important.
Disclosure of Invention
In view of the above problems, in one aspect, the present invention provides a metallurgical slag waste heat recovery method, which includes:
adding the cooled slag after finishing the grains into the liquid slag, and stirring to obtain solidified mixed slag;
coarse crushing the mixed slag to obtain granulated slag and smoke dust;
cooling the granulated slag to obtain hot air and cooling slag;
finishing the cooling slag;
and recycling the smoke dust, the hot air and the cooling slag after finishing.
Further, the liquid slag is newly generated high-temperature molten liquid slag in the metallurgical production process.
Further, the granulating comprises crushing and sieving large mixed slag in the cooling slag and removing powder in the mixed slag.
Further, the cooling slag comprises a first particle size range cooling slag obtained after cooling and granulating the granulated slag.
Further, the average temperature of the cooling slag is 150 ℃ or less.
Further, recycling the smoke dust and the hot air comprises:
the dust and the hot air are subjected to dust removal and then sent to a waste heat boiler to exchange heat with water to generate high-temperature water, water vapor and medium-low temperature air; wherein the medium-low temperature wind is transmitted back to the cooling device for recycling;
recycling the cooling slag after finishing the grains comprises the following steps:
distinguishing the cooling slag according to the granularity, wherein the cooling slag comprises cooling slag in a first granularity range and cooling slag in a residual range;
adding the recovered cooling slag in the first granularity range into liquid slag to perform liquid elimination and solidification on the liquid slag; and recycling the cooling slag in the residual range.
In another aspect, the invention provides a metallurgical slag waste heat recovery system, wherein the recovery device comprises a stirring device, a crushing device, a cooling device, a granulating device and a waste heat boiler;
wherein,,
the stirring device is used for adding the cooled slag after finishing the grains into the liquid slag, and stirring to obtain solidified mixed slag;
the crushing device is used for coarsely crushing the mixed slag to obtain granulated slag and smoke dust;
the cooling device is used for cooling the granulated slag to obtain hot air and cooling slag;
the waste heat boiler is used for recycling the smoke dust and the hot air;
the granulating device is used for granulating the cooling slag and recycling the cooling slag.
Further, the recovery and utilization of the smoke dust and the hot air by the waste heat boiler comprises: the dust and the hot air are sent to a waste heat boiler to exchange heat with water to generate high temperature water, water vapor and medium and low temperature air after dust removal; wherein the medium-low temperature wind is transmitted back to the cooling device for recycling;
the recycling of the cooling slag after finishing the grain comprises the following steps: distinguishing the cooling slag according to the granularity, wherein the cooling slag comprises cooling slag in a first granularity range and cooling slag in a residual range; adding the recovered cooling slag in the first granularity range into liquid slag to perform liquid elimination and solidification on the liquid slag; and recycling the cooling slag in the residual range.
Further, the cooling device is a sealed annular cooling mechanism and comprises an annular cooler shell and an inner annular track arranged inside the annular cooler shell;
the internal annular track is used for transferring the trolley;
the trolley is used for containing the granulated slag, and the granulated slag enters the cooling device along with the trolley and then moves along the internal annular track to be cooled.
Further, the recovery system also comprises a first dust removing device and a second dust removing device;
the first dust removing device is used for removing dust from the smoke dust discharged from the crushing device;
the second dust removing device is used for removing dust from the hot air discharged from the cooling device.
The invention has the beneficial effects that:
adding the cooled slag after finishing the grains into the liquid slag, and stirring to obtain solidified mixed slag; coarse crushing the mixed slag to obtain granulated slag and smoke dust, and cooling the granulated slag to obtain hot air and cooling slag; the method is used for recycling the obtained smoke dust, hot air and the granulated cooling slag, and the waste heat (comprising the cooling slag, the smoke dust and the hot air) in the metallurgical slag is recycled thoroughly, so that the whole recycling method is low in cost, pollution-free, simple in process, efficient and practical, and is suitable for recycling the waste heat of various metallurgical slag.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a flow chart of a metallurgical slag waste heat recovery method in an embodiment of the invention;
FIG. 2 illustrates a flow chart of the operation of the metallurgical slag waste heat recovery system in an embodiment of the present invention;
FIG. 3 shows a schematic diagram of a cooling device in an embodiment of the invention;
in the figure, 1, cooling slag; 2. a slag pot; 3. a stirring device; 4. a crushing device; 5. a first dust removing device; 6. a cooling device; 7. a hot air collecting duct; 8. a blower; 9. a granulating device; 10. a metallurgical slag yard; 11. a second dust removing device; 12. a waste heat boiler; 13. an annular cooler housing; 14. an inner annular track; 15. an inlet; 16. an outlet; 17. and (5) a trolley.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a metallurgical slag waste heat recovery method and a metallurgical slag waste heat recovery device, wherein the waste heat recovery method utilizes the granulated cooling slag 1 to remove liquid and granulate high-temperature liquid slag, and after heat exchange between a circular cooler and cold air, waste heat is recovered and utilized through a waste heat boiler 12, so that the purpose of simply and efficiently recovering the metallurgical slag waste heat is achieved.
In order to achieve the above object, the present invention provides a metallurgical slag waste heat recovery method, as shown in fig. 1, for recovering metallurgical slag waste heat by:
adding the cooled slag 1 after finishing the grains into the liquid slag, and stirring to obtain solidified mixed slag;
coarse crushing the mixed slag to obtain granulated slag and smoke dust;
cooling the granulated slag to obtain hot air and cooling slag 1;
finishing the cooling slag 1;
recycling the smoke dust, the hot air and the cooling slag 1; the method specifically comprises the following steps: dust is removed from the smoke dust and the hot air, and the dust and the hot air are sent to the waste heat boiler 12 to exchange heat with water to generate high-temperature water, water vapor and medium-low temperature air; wherein the medium-low temperature wind is transmitted back to the cooling device 6 for recycling; distinguishing the cooling slag 1 according to the granularity, wherein the cooling slag comprises cooling slag in a first granularity range and cooling slag in a residual range; adding the recovered cooling slag in the first granularity range into liquid slag to perform liquid elimination and solidification on the liquid slag; and recycling the cooling slag in the residual range for other process utilization.
The method specifically comprises the following steps:
step one: metallurgical slag collecting and transporting
The newly generated high-temperature molten liquid slag in the metallurgical production process is intensively discharged into the slag pot 2, and then the slag pot 2 is transported to a designated position of the next process.
Step two: slag mixing
The cooled solid metallurgical slag is utilized for finishing grains, the cooling slag 1 with proper granularity is selected and poured into a slag pot 2 for containing high-temperature liquid slag, and the granularity and the dosage of the cooling slag 1 can be adjusted by an actual process. And then the stirring device 3 is adopted to forcedly stir the hot slag and the cooling slag 1 in the slag pot 2, so that the high-temperature molten metallurgical slag is solidified, and the purpose of liquid elimination is achieved.
Step three: thermal crushing
In order to fully recover heat in metallurgical slag, the mixed slag in the stirring device 3 is poured into the crushing device 4 for crushing, and coarse crushing is performed in a roller crusher in the embodiment to granulate the metallurgical slag, and the granularity of the slag can be adjusted by an actual process. The granulated slag is then poured into the trolley 17. The dust generated in the crushing process is sent to the first dust removing device 5 for treatment.
Step four: cooling and heat exchanging
The granulated slag enters the cooling device 6 along with the trolley 17 and moves along the internal annular track 14 of the cooling device 6, the cooling device 6 is provided with a plurality of cooling blowers 8 which are positioned at the bottom of the trolley 17, cold air is continuously blown upwards to cool hot slag and exchange heat with the cold air to obtain hot air and cooled slag 1, the average temperature of the cooled metallurgical slag is required to be less than or equal to 150 ℃, the cooling time is adjusted according to actual equipment and technology, then the cooled slag 1 is sent to the granulating device 9 at an outlet 16 of the annular cooling device 6 by a tape machine, a plurality of pipelines are arranged at the top of the cooling device 6 for centralization and then are sent to the second dust removing device 11, and the quantity of the blowers 8 and the quantity of hot air pipelines are determined according to the size of the actual cooling device 6.
Step five: cold slag granule
After the cooled cooling slag 1 is crushed and screened, the cooling slag 1 with proper granularity is independently stored and used in the second step, and the cooling slag with the residual range is conveyed to a metallurgical slag yard 10 for stacking and recycling in other modes.
Step six: dust removal and waste heat recovery
The hot air is conveyed to the second dust removing device 11 through a pipeline to remove dust to obtain clean hot air, the clean hot air is stably conveyed to the waste heat boiler 12 through gas collection, heat exchange with water is carried out to generate high temperature water, water vapor and medium-low temperature air which can be used in other working procedures to achieve the purpose of waste heat recovery and reutilization, and the medium-low temperature air is conveyed back to the cooler through the pipeline for recycling.
Based on the method, the invention provides a metallurgical slag waste heat recovery system, as shown in fig. 2, which comprises a slag pot 2, a stirring device 3, a crushing device 4, a first dust removal device 5, a second dust removal device 11, a cooling device 6, a grain sizing device 9, a metallurgical slag yard 10 and a waste heat boiler 12.
Wherein,,
the stirring device 3 is used for adding the granulated cooling slag 1 into liquid slag, stirring the liquid slag to achieve the purpose of eliminating liquid, and obtaining solidified mixed slag;
the crushing device 4 is used for coarsely crushing the mixed slag to obtain granulated slag and smoke dust;
the cooling device 6 is used for cooling the granulated slag to obtain hot air and cooling slag 1;
the waste heat boiler 12 is used for recycling the smoke dust and the hot air;
the granule finishing device 9 is used for crushing, screening and finishing the cooling slag 1 and then recycling the cooling slag, and specifically comprises: the smoke dust and the hot air enter a first dust removing device 5 or a second dust removing device 11 for dust removal and then are sent to a waste heat boiler 12 for heat exchange with water to generate high temperature water, water vapor and medium and low temperature air; wherein the medium-low temperature wind is transmitted back to the cooling device 6 for recycling; the recycling of the cooling slag 1 by the grain sizing device 9 includes: and the cooling slag 1 is crushed, sieved and granulated and then used as cooled solid metallurgical slag to carry out granulation on liquid slag.
The specific working flow of the metallurgical slag waste heat recovery system is shown in fig. 2:
the newly generated high-temperature molten liquid slag in the metallurgical production process is intensively discharged into the slag pot 2, and then the slag pot 2 is transported to a designated position of the next process, i.e., near the stirring device 3.
Pouring cooling slag 1 with proper granularity into a slag pot 2 for containing high-temperature liquid slag, wherein the granularity and the dosage of the cooling slag 1 can be adjusted by an actual process. And then the stirring device 3 is adopted to forcedly stir the hot slag and the cooling slag 1 in the slag pot 2, so that the high-temperature molten metallurgical slag is solidified, and the purpose of liquid elimination solidification is achieved. The stirring device 3 can adopt manual stirring or mechanical stirring, preferably selects mechanical stirring, and can stir the cooling slag 1 and the liquid slag in the slag pot 2 by setting a proper rotating speed, so that the high-temperature molten metallurgical slag is solidified, and the mixed slag is obtained.
In order to fully recycle the heat in the metallurgical slag, the mixed slag in the stirring device 3 is poured into the crushing device 4 for coarse crushing. In this embodiment, the crushing device 4 is preferably a roller crusher, and the roller crusher is used for coarse crushing of the mixed slag to granulate the metallurgical slag, so as to obtain granulated slag and smoke dust, and the granularity of the granulated slag can be adjusted by an actual process. And then pouring the obtained granulated slag into a trolley 17, and delivering the smoke dust generated in the crushing process to a first dust removing device 5 for treatment.
The granulated slag enters the cooling device 6 along with the trolley 17 and moves along the inner circular track 14 of the cooling device 6. The cooling device 6 is provided with a plurality of cooling blowers 8 which are positioned at the bottom of the trolley 17, and continuously blows cold air upwards to cool hot slag and exchange heat with the cold air to obtain hot air and cooling slag 1.
Specifically, the average temperature of the cooling slag 1 is required to be less than or equal to 150 ℃, the cooling time is adjusted according to actual equipment and technology, then the cooling slag 1 is conveyed to the grain sizing device 9 at the outlet 16 of the cooling device 6 by a tape machine, hot air is conveyed to the second dust removing device 11 after being concentrated by a plurality of hot air collecting pipelines 7 arranged at the top of the cooling device 6, and the number of blowers 8 and the number of the hot air collecting pipelines 7 are determined according to the size of the actual cooling device 6. The cooling device 6 in this embodiment is a sealed annular cooling mechanism, specifically, as shown in fig. 3, including an annular cooler housing 13 and an inner annular rail 14 disposed inside the annular cooler housing 13, the inner annular rail 14 is used for transferring a trolley 17, the trolley 17 is used for containing granulated slag, after the granulated slag enters the sealed annular cooling mechanism along with the trolley 17, the trolley 17 moves along the inner annular rail 14, and the sealed annular cooling mechanism is further provided with an outlet 16 and an inlet 15 for entering and outputting the granulated slag.
The cooled cooling slag 1 is conveyed to a grain sizing device 9, the grain sizing device 9 breaks and screens the cooling slag 1, the cooling slag 1 with proper granularity is independently stored and used for liquid slag liquid elimination and solidification, and the cooling slag with the residual range is conveyed to a metallurgical slag yard 10 for stacking and recycling in other modes. The hot air generated in the cooling process is conveyed to the second dust removing device 11 through a pipeline to remove dust to obtain clean hot air, the clean hot air is stably conveyed to the waste heat boiler 12 through gas collection, and heat exchange with water to generate high temperature water, water vapor and medium-low temperature air which can be used in other working procedures to achieve the purpose of waste heat recovery and reutilization, wherein the medium-low temperature air is conveyed back to the cooler through the pipeline for recycling.
The positions of the devices in the metallurgical slag waste heat recovery system are not limited, the use flow of the devices is shown in fig. 2, the installation positions of the devices are not strictly limited, and the positions or the installation modes of the devices can be correspondingly adjusted according to practical application.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A metallurgical slag waste heat recovery method, characterized in that the recovery method comprises:
adding the cooled slag (1) subjected to grain sizing into the liquid slag, and stirring to obtain solidified mixed slag;
coarse crushing the mixed slag to obtain granulated slag and smoke dust;
cooling the granulated slag to obtain hot air and cooling slag (1);
finishing the cooling slag (1);
and recycling the smoke dust, the hot air and the cooling slag (1) after the granule finishing.
2. The method for recycling waste heat of metallurgical slag according to claim 1, wherein,
the liquid slag is high-temperature molten liquid slag newly generated in the metallurgical production process.
3. The method for recycling waste heat of metallurgical slag according to claim 1, wherein,
the granulating comprises crushing and screening large mixed slag in the cooling slag (1) and removing powder in the mixed slag.
4. The method for recovering waste heat of metallurgical slag according to claim 1 or 2, wherein,
the cooling slag (1) comprises cooling slag of a first particle size range obtained after cooling and granulating the granulated slag.
5. The method for recycling waste heat of metallurgical slag according to claim 1, wherein,
the average temperature of the cooling slag (1) is less than or equal to 150 ℃.
6. The method for recycling waste heat of metallurgical slag according to claim 1, wherein,
recycling the smoke dust and the hot air comprises the following steps:
the dust and the hot air are sent to a waste heat boiler (12) for heat exchange with water to generate high-temperature water, water vapor and medium-low temperature air after dust removal; wherein the medium-low temperature wind is transmitted back to the cooling device (6) for recycling;
recycling the cooling slag (1) after finishing comprises the following steps:
distinguishing the cooling slag (1) according to the granularity, wherein the cooling slag comprises cooling slag in a first granularity range and cooling slag in a residual range;
adding the recovered cooling slag in the first granularity range into liquid slag to perform liquid elimination and solidification on the liquid slag; and recycling the cooling slag in the residual range.
7. A metallurgical slag waste heat recovery system is characterized in that,
the recycling device comprises a stirring device (3), a crushing device (4), a cooling device (6), a grain sizing device (9) and a waste heat boiler (12);
wherein,,
the stirring device (3) is used for adding the cooled slag (1) after finishing the grains into the liquid slag, and stirring to obtain solidified mixed slag;
the crushing device (4) is used for coarsely crushing the mixed slag to obtain granulated slag and smoke dust;
the cooling device (6) is used for cooling the granulated slag to obtain hot air and cooling slag (1);
the waste heat boiler (12) is used for recycling the smoke dust and the hot air;
the granulating device (9) is used for granulating the cooling slag (1) and recycling the cooled slag.
8. The metallurgical slag heat recovery system of claim 7, wherein the waste heat recovery system comprises a heat recovery unit,
the waste heat boiler (12) recycling the smoke dust and hot air comprises: the dust and hot air are sent to a waste heat boiler (12) for heat exchange with water to generate high-temperature water, water vapor and medium-low temperature air after dust removal; wherein the medium-low temperature wind is transmitted back to the cooling device (6) for recycling;
the recycling of the cooling slag (1) after finishing comprises the following steps: distinguishing the cooling slag (1) according to the granularity, wherein the cooling slag comprises cooling slag in a first granularity range and cooling slag in a residual range; adding the recovered cooling slag in the first granularity range into liquid slag to perform liquid elimination and solidification on the liquid slag; and recycling the cooling slag in the residual range.
9. The metallurgical slag heat recovery system of claim 7 or 8, wherein the waste heat recovery system comprises a heat recovery unit,
the cooling device (6) is a sealed annular cooling mechanism and comprises an annular cooler shell (13) and an inner annular track (14) arranged inside the annular cooler shell (13);
the inner annular track (14) is used for transferring the trolley (17);
the trolley (17) is used for containing granulated slag, and the granulated slag enters the cooling device (6) along with the trolley (17) and then moves and cools along the inner annular track (14).
10. The metallurgical slag heat recovery system of claim 7 or 8, wherein the waste heat recovery system comprises a heat recovery unit,
the recovery system also comprises a first dust removing device (5) and a second dust removing device (11);
the first dust removing device (5) is used for removing dust from the smoke dust discharged from the crushing device (4);
the second dust removing device (11) is used for removing dust from the hot air discharged from the cooling device (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504437.XA CN116219091A (en) | 2022-11-28 | 2022-11-28 | Metallurgical slag waste heat recovery method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504437.XA CN116219091A (en) | 2022-11-28 | 2022-11-28 | Metallurgical slag waste heat recovery method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116219091A true CN116219091A (en) | 2023-06-06 |
Family
ID=86575628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211504437.XA Pending CN116219091A (en) | 2022-11-28 | 2022-11-28 | Metallurgical slag waste heat recovery method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116219091A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130206875A1 (en) * | 2010-09-13 | 2013-08-15 | Paul Wurth S.A. | Dry granulation of metallurgical slag |
| CN104988255A (en) * | 2015-06-06 | 2015-10-21 | 廖洪强 | Method and equipment system for recycling liquid slag waste heat and super-micronizing tailings |
| CN105018659A (en) * | 2015-07-08 | 2015-11-04 | 北京中冶设备研究设计总院有限公司 | Method and device for secondary cooling after granulating slag by dry method |
| CN107190110A (en) * | 2017-05-11 | 2017-09-22 | 山西大学 | A kind of high-temperature slag dry colling granulation residual neat recovering system and method |
| CN212270143U (en) * | 2020-05-20 | 2021-01-01 | 南京凯盛开能环保能源有限公司 | Blast furnace slag waste heat power generation system |
| CN216432548U (en) * | 2021-11-25 | 2022-05-03 | 南京凯盛开能环保能源有限公司 | Blast furnace slag steel ball granulation waste heat recovery system |
-
2022
- 2022-11-28 CN CN202211504437.XA patent/CN116219091A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130206875A1 (en) * | 2010-09-13 | 2013-08-15 | Paul Wurth S.A. | Dry granulation of metallurgical slag |
| CN104988255A (en) * | 2015-06-06 | 2015-10-21 | 廖洪强 | Method and equipment system for recycling liquid slag waste heat and super-micronizing tailings |
| CN105018659A (en) * | 2015-07-08 | 2015-11-04 | 北京中冶设备研究设计总院有限公司 | Method and device for secondary cooling after granulating slag by dry method |
| CN107190110A (en) * | 2017-05-11 | 2017-09-22 | 山西大学 | A kind of high-temperature slag dry colling granulation residual neat recovering system and method |
| CN212270143U (en) * | 2020-05-20 | 2021-01-01 | 南京凯盛开能环保能源有限公司 | Blast furnace slag waste heat power generation system |
| CN216432548U (en) * | 2021-11-25 | 2022-05-03 | 南京凯盛开能环保能源有限公司 | Blast furnace slag steel ball granulation waste heat recovery system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102268495B (en) | Process technology and equipment for granulating blast-furnace slag and utilizing waste heat | |
| CN102559957B (en) | Centrifugal type fusion slag quenching and dry type granulating, and waste heat recovery power generation system and method | |
| CN104988255A (en) | Method and equipment system for recycling liquid slag waste heat and super-micronizing tailings | |
| CN101660014A (en) | Molten blast furnace slag sensible heat recovery method and device | |
| CN101871025B (en) | Metallurgical molten slag dry-type processing device and processing method thereof | |
| CN110982967A (en) | Method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide | |
| CN109811095B (en) | Heat accumulating type stainless steel slag waste heat recovery device and method | |
| CN111270026A (en) | Blast furnace slag dry type waste heat recovery system and method | |
| CN212270143U (en) | Blast furnace slag waste heat power generation system | |
| KR20220144816A (en) | Apparatus and method for blast furnace molten slag granulation and waste heat recovery | |
| CN104975117A (en) | Blast furnace slag overall treatment and sensible heat recovery power generation system and method | |
| CN104073578B (en) | The dry-type sensible heat recovery and processing system of blast-furnace slag and method | |
| CN103820588A (en) | Quenching dry type broken fusion blast furnace slag sensible heat recovery method and device | |
| CN202530095U (en) | Centrifugal molten slag dry granulation and waste heat recovery power generation system | |
| CN101880737A (en) | System and method for recovering waste heat of continuous hot steel slag | |
| CN111271978A (en) | High-temperature slag waste heat recovery system | |
| CN109628669A (en) | A kind of blast furnace cinder sensible heat recovery method and system | |
| CN107058653B (en) | High temperature furnace slag recoverying and utilizing method | |
| CN101864504B (en) | Method for raising air temperature of hot blast stove by recovering sensible heat of blast furnace slag | |
| TWI793683B (en) | Method and device for slag cooling, granulation and sludge drying | |
| CN214193316U (en) | Liquid blast furnace slag dry-type granulation treatment device | |
| CN212378525U (en) | High-temperature slag waste heat recovery system | |
| CN219244300U (en) | Vertical cooling waste heat recovery production system for pellets | |
| CN201825962U (en) | Dry-type metallurgical molten slag treating device | |
| CN218811836U (en) | Metallurgical slag waste heat efficient recovery device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |